‘Bus number 75 goes to the Central market.’ Here, the use of number is _____

Correct option is B

In the given sentence, "bus number 75" identifies a specific bus, distinguishing it from other buses. It doesn't indicate quantity, order, or position. Hence, the usage of the number 75 is nominal, as it functions as a name or label.
A cardinal number indicates quantity (e.g., three buses), an ordinal number indicates order or position (e.g., the first bus), and a serial number indicates a sequence or identification (e.g., bus number 75).